This page provides access to all of my presentations in pdf format.  I use high definition photos for my presentations so that they still look good when they are projected onto large screens.  A consequence of using such high definition photos is that they produce very large Powerpoint files.  Converting the Powerpoint files into pdf format results in much smaller files that can be attached to emails, etc.  These files are viewable online and provide good quality replicas of the original photos.  The only thing that they do not reproduce are the embedded videos.  Slides which contain an embedded video will exhibit the first frame of the video without any indication that the slide contains a video.  So be aware that slides having a blacked out or otherwise questionable picture are simply slides that contain an embedded video.